<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>
<body>
    <div id="app">
        <!-- v-else-if也需要配合if使用 -->
        <input type="text" name="" id="" v-model.number="msg">
        <p v-if="msg>90">A</p>
        <p v-else-if="msg>80">B</p>
        <p v-else-if="msg>70">C</p>
        <p v-else>D</p>
    </div>
    <script>
        new Vue({
            el:'#app',
            data(){
                return{
                    msg:0
                }
            }
        })
    </script>
</body>
</html>